Compounds and methods for delivery of prostacyclin analogs

a technology of prostacyclin and analogs, which is applied in the field of prostacyclin analogs, can solve the problems of ineffective administration of many valuable pharmacologically active compounds, potential local trauma to patients, and considerable discomfort to patients, and achieve the effect of increasing the oral bioavailability of treprostinil and the bioavailability of compound

Active Publication Date: 2005-04-21
UNITED THERAPEUTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019] In various methods the oral bioavailability of the compound is greater than the oral bioavailability of treprostinil, such as at least 50% or 100% greater than the oral bioavailability of treprostinil. The present methods can also comprise administering pharmaceutically effective amount of a p-glycoprotein inhibitor, simultaneously, sequentially, or prior to administration of the compound of structure II. In some embodiments the p-glycoprotein inhibitor is administered orally or intravenously. The disclosed methods can be used to treat pulmonary hypertension.
[0020] The present invention also provides a method of increasing the

Problems solved by technology

Many valuable pharmacologically active compounds cannot be effectively administered orally for various reasons and are generally administered via intravenous or intramuscular routes.
These rou

Method used

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  • Compounds and methods for delivery of prostacyclin analogs
  • Compounds and methods for delivery of prostacyclin analogs
  • Compounds and methods for delivery of prostacyclin analogs

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0196] In this Example, the bioavailability of treprostinil in rats after dosing orally, intraduodenally, intracolonically and via the portal vein was compared to determine possible barriers to bioavailability. In addition to bioavailability, a number of pharmacokinetic parameters were determined.

Animal Dosing

[0197] The bioavailability of treprostinil was evaluated in Sprague-Dawley, male rats. Fifteen surgically modified rats were purchased from Hilltop Lab Animals (Scottdale, Pa.). The animals were shipped from Hilltop to Absorption Systems' West Chester University (West Chester, Pa.), where they were housed for at least twenty-four hours prior to being used in the study. The animals were fasted for approximately 16 hours prior to dosing. The fifteen rats used in this study were divided into five groups (I, II, III, IV and V).

[0198] The weight of the animals and the dosing regimen are presented in Table 1.

TABLE 1DoseWeightRoute ofStudyVolumeDoseGroupRat #(g)AdministrationDay...

example 2

[0223] In this Example, Treprostinil concentrations were determined in male Sprague-Dawley rats following a single oral dose of the following compounds:

Experimental

Dosing Solution Preparation

[0224] All dosing vehicles were prepared less than 2 hours prior to dosing.

1. Treprostinil Methyl Ester

[0225] A solution of treprostinil methyl ester was prepared by dissolving 2.21 mg of treprostinil methyl ester with 0.85 mL of dimethylacetamide (DMA). This solution was then diluted with 7.65 mL of PEG 400:Polysorbate 80:Water, 40:1:49. The final concentration of the dosing vehicle was 0.26 mg / mL of treprostinil methyl ester equivalent to 0.25 mg / mL of Treprostinil. The dosing vehicle was a clear solution at the time of dosing.

2. Treprostinil Benzyl Ester

[0226] A solution of treprostinil benzyl ester was prepared by dissolving 2.58 mg of treprostinil benzyl ester with 0.84 mL of dimethylacetamide (DMA). This solution was then diluted with 7.54 mL of PEG 400:Polysorbate 80:Water, 40:...

example 3

[0244] This example illustrates a pharmacokinetic study of treprostinil following administration of a single duodenal dose of treprostinil and various prodrugs of the present invention.

[0245] In this study, the area under the curve of Treprostinil in male Sprague-Dawley rats following a single intraduodenal dose of treprostinil monophosphate (ring), treprostinil monovaline (ring), treprostinil monoalanine (ring) or treprostinil monoalanine (chain), prodrugs of treprostinil was compared. The compounds were as follows:

[0246] having the following substituents:

CompoundR1R2R3treprostinilH—PO3H3Hmonophosphate(ring)treprostinilH—COCH(CH(CH3)2)NH2Hmonovaline(ring)treprostinilH—COCH(CH3)NH2Hmonoalanine(ring)treprostinilHH—COCH(CH3)NH2monoalanine(chain)

Experimental

Dosing Solution Preparation

[0247] All dosing vehicles were prepared less than 2 hours prior to dosing.

1. Treprostinil Monophosphate (Ring)

[0248] A dosing solution of treprostinil monophosphate (ring) was prepared by disso...

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Abstract

This invention pertains generally to prostacyclin analogs and methods for their use in promoting vasodilation, inhibiting platelet aggregation and thrombus formation, stimulating thrombolysis, inhibiting cell proliferation (including vascular remodeling), providing cytoprotection, preventing atherogenesis and inducing angiogenesis. Generally, the compounds and methods of the present invention increase the oral bioavailability and circulating concentrations of treprostinil when administered orally. Compounds of the present invention have the following formula:

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS [0001] This application claims benefit of U.S. Provisional Application Ser. No. 60 / 472,407, filed on May 22, 2003, the entire contents of which are incorporated by reference herein.FIELD OF THE INVENTION [0002] This invention pertains generally to prostacyclin analogs and methods for their use in promoting vasodilation, inhibiting platelet aggregation and thrombus formation, stimulating thrombolysis, inhibiting cell proliferation (including vascular remodeling), providing cytoprotection, preventing atherogenesis and inducing angiogenesis. Through these prostacyclin-mimetic mechanisms, the compounds of the present invention may be used in the treatment of / for: pulmonary hypertension, ischemic diseases (e.g., peripheral vascular disease, Raynaud's phenomenon, Scleroderma, myocardial ischemia, ischemic stroke, renal insufficiency), heart failure (including congestive heart failure), conditions requiring anticoagulation (e.g., post MI, post...

Claims

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Application Information

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IPC IPC(8): A61KA61K31/19A61K31/215A61K31/557C07C69/76
CPCC07C59/70C07C69/712C07C229/08C07C235/06C07C235/08A61K31/235C07C2103/10C07F9/091C07F9/117C07C51/412C07C259/06C07C2603/10C07C59/13A61K31/192A61K31/216A61K31/223A61P11/00A61P13/12A61P15/00A61P17/00A61P17/06A61P25/00A61P27/02A61P29/00A61P35/00A61P43/00A61P7/02A61P9/00A61P9/04A61P9/08A61P9/10A61P9/12A61P9/14C07C405/00A61K31/19A61K31/557A61K9/0053A61K9/0019
Inventor PHARES, KENMOTTOLA, DAVID
Owner UNITED THERAPEUTICS CORP
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